[runtime] Add %ToString and %_ToString and remove the TO_STRING builtin.

src/contexts.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CONTEXTS_H_
 #define V8_CONTEXTS_H_
 
 #include "src/heap/heap.h"
 #include "src/objects.h"
 
@@ skipping 115 matching lines @@
   V(SAR_BUILTIN_INDEX, JSFunction, sar_builtin)                             \
   V(SAR_STRONG_BUILTIN_INDEX, JSFunction, sar_strong_builtin)               \
   V(SHL_BUILTIN_INDEX, JSFunction, shl_builtin)                             \
   V(SHL_STRONG_BUILTIN_INDEX, JSFunction, shl_strong_builtin)               \
   V(SHR_BUILTIN_INDEX, JSFunction, shr_builtin)                             \
   V(SHR_STRONG_BUILTIN_INDEX, JSFunction, shr_strong_builtin)               \
   V(STACK_OVERFLOW_BUILTIN_INDEX, JSFunction, stack_overflow_builtin)       \
   V(STRING_ADD_LEFT_BUILTIN_INDEX, JSFunction, string_add_left_builtin)     \
   V(STRING_ADD_RIGHT_BUILTIN_INDEX, JSFunction, string_add_right_builtin)   \
   V(SUB_BUILTIN_INDEX, JSFunction, sub_builtin)                             \
-  V(SUB_STRONG_BUILTIN_INDEX, JSFunction, sub_strong_builtin)               \
-  V(TO_STRING_BUILTIN_INDEX, JSFunction, to_string_builtin)
+  V(SUB_STRONG_BUILTIN_INDEX, JSFunction, sub_strong_builtin)
 
 
 #define NATIVE_CONTEXT_IMPORTED_FIELDS(V)                                     \
   V(ARRAY_CONCAT_INDEX, JSFunction, array_concat)                             \
   V(ARRAY_POP_INDEX, JSFunction, array_pop)                                   \
   V(ARRAY_PUSH_INDEX, JSFunction, array_push)                                 \
   V(ARRAY_SHIFT_INDEX, JSFunction, array_shift)                               \
   V(ARRAY_SPLICE_INDEX, JSFunction, array_splice)                             \
   V(ARRAY_SLICE_INDEX, JSFunction, array_slice)                               \
   V(ARRAY_UNSHIFT_INDEX, JSFunction, array_unshift)                           \
@@ skipping 492 matching lines @@
   static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object);
 #endif
 
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_